Can someone explain what is an Activity Series? I looked at sites that is explaining it but I do not get it. Please try to make it simple as possible because I am really dumb.
Thanks :)

An activity series is a list of elements listed in order of their ability (reactivity) to remove hydrogen from water, or displace other elements from hydroxides.

A longer and better explanation can be found at http://antoine.frostburg.edu/chem/senese/101/redox/faq/activity-series.shtml